我想从数据库中获取数据，并在列表视图中显示我已经创建了一个Arraylist并通过这个将listview连接到数据库，但我只能显示一个每行中的列，但我正在寻找的是一种在数据库的每一行显示我的表的所有列的详细信息的方法，我的意思是我想显示插入其他列的我的行的描述我的listview中每行主要内容下面的较小字体。请你帮我解决一下吗？我曾尝试使用一个使用了SimpleCursorAdapter的代码片段，但我在这里无法实现！我还发现我可以使用hashmap但是我已经找到的样本都是关于使用字符串数组来填写列表视图，请帮助我！这实际上非常紧急，任何建议都将受到赞赏。
这是我的layout.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#86868a"
>
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="@style/CodeFont"
>
</ListView>
<RelativeLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
<Button
android:id="@+id/DeleteSelectedGoodsButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/DeleteSelectedGoods"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"/>
<Button
android:id="@+id/ConfirmDelete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/ConfirmDeleteButton"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
/>
<Button
android:id="@+id/CancelButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/CancelButton"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
</LinearLayout>
这是我的SQLHelper
public class ExternalDbOpenHelper extends SQLiteOpenHelper {
//-----------------------------------------------------
public static String DB_PATH;
//-----------------------------------------------------
public static String DB_NAME;
public SQLiteDatabase database;
public final Context context;
/////Adapted From spinner
/** A constant, stores the the table name */
private static final String TABLE_NAME = "Tbl_Goods";
private static final String GOOD_ID = "Good_ID";
private static final String CART_ID = "Cart_ID";
private static final String GOOD_NAME = "Good_Name";
private static final String GOOD_UNITPRICE = "Good_UnitPrice";
private static final String QUANTITY = "Quantity";
////---------------------------
public SQLiteDatabase getDb() {
return database;
}
public ExternalDbOpenHelper(Context context, String databaseName) {
super(context, databaseName, null, 1);
this.context = context;
//-------------------------------------------------
String packageName = context.getPackageName();
DB_PATH = String.format("//data//data//%s//databases//", packageName);
DB_NAME = databaseName;
openDataBase();
}
//--------------------------------------------------------------------------------
public void createDataBase() {
boolean dbExist = checkDataBase();
if (!dbExist) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e(this.getClass().toString(), "Copying error");
throw new Error("Error copying database!");
}
} else {
Log.i(this.getClass().toString(), "Database already exists");
}
}
//--------------------------------------------------------------
private boolean checkDataBase() {
SQLiteDatabase checkDb = null;
try {
String path = DB_PATH + DB_NAME;
checkDb = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLException e) {
Log.e(this.getClass().toString(), "Error while checking db");
}
//---------------------------------------------------
if (checkDb != null) {
checkDb.close();
}
return checkDb != null;
}
//-----------------------------------------------------
private void copyDataBase() throws IOException {
// ----------------------------------------------
//------------------- assets----------------------
InputStream externalDbStream = context.getAssets().open(DB_NAME);
// ----------------------------------------------------------
String outFileName = DB_PATH + DB_NAME;
// -------------------------------------------------
OutputStream localDbStream = new FileOutputStream(outFileName);
//------------------------------------
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
// -----------------------------
localDbStream.close();
externalDbStream.close();
}
public SQLiteDatabase openDataBase() throws SQLException {
String path = DB_PATH + DB_NAME;
if (database == null) {
createDataBase();
database = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READWRITE);
}
return database;
}
@Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
////-----------------------Adapted From SQLSpinner
/** Inserts a new contact to the table contacts */
public long insert(ContentValues contentValues){
long rowID = database.insert(TABLE_NAME, null, contentValues);
return rowID;
}
/** Updates a contact */
public int update(ContentValues contentValues,String contactID){
int cnt = database.update(TABLE_NAME, contentValues, "_id=" + contactID, null);
return cnt;
}
/** Deletes a contact from the table */
public int del(String contactID){
int cnt = database.delete(TABLE_NAME, "_id="+contactID, null);
return cnt;
}
/** Returns all the contacts in the table */
public Cursor getAllContacts(){
return database.query(TABLE_NAME, new String[] { GOOD_ID, CART_ID , GOOD_NAME,GOOD_UNITPRICE,QUANTITY } , null, null, null, null, GOOD_NAME + " asc ");
}
/** Returns a contact by passing its id */
public Cursor getContactByID(String contactID){
return database.query(TABLE_NAME, new String[] { GOOD_ID, CART_ID , GOOD_NAME,GOOD_UNITPRICE,QUANTITY} , "_ID="+contactID, null, null, null, GOOD_NAME + " asc ");
}
////-----------------------------------
@Override
public void onCreate(SQLiteDatabase db) {}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}
这是我的活动：
public class PrepopSqliteDbActivity extends ListActivity {
private static final String DB_NAME = "NFC.sqlite";
//------------------------------------------------------------
private static final String TABLE_NAME = "Tbl_Goods";
private static final String GOOD_ID = "Good_ID";
private static final String CART_ID = "Cart_ID";
private static final String GOOD_NAME = "Good_Name";
private static final String GOOD_UNITPRICE = "Good_UnitPrice";
private static final String QUANTITY = "Quantity";
private SQLiteDatabase database;
private ListView listView;
private ArrayList<String> goods;
//////-----------------Adapted From SQLSpinner
ArrayAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.table_row);
//-------------------------------------------------------
ExternalDbOpenHelper dbOpenHelper = new ExternalDbOpenHelper(this, DB_NAME);
database = dbOpenHelper.openDataBase();
//--------------------------------------
fillgoods();
setUpList();
//////Cancel Button
Button btnCancel=(Button)findViewById(R.id.CancelButton);
btnCancel.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
finish();
}
});
}
private void setUpList() {
//---------------------------------layout------------------------------------
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_single_choice, goods));
listView = getListView();
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
mAdapter=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_single_choice, goods);
//---------------------------------------------------------------------------
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position,long id) {
Toast.makeText(getApplicationContext(),
((TextView) view).getText().toString(),
Toast.LENGTH_SHORT).show();
}
});
}
//--------------------------------------------------------------------
private void fillgoods() {
goods = new ArrayList<String>();
Cursor goodCursor = database.query(TABLE_NAME,
new String[]
{GOOD_UNITPRICE,GOOD_NAME,GOOD_ID, CART_ID,GOOD_UNITPRICE ,QUANTITY},
null, null, null, null
, GOOD_NAME);
goodCursor.moveToFirst();
if(!goodCursor.isAfterLast()) {
do {
String name = goodCursor.getString(1);
goods.add(name);
} while (goodCursor.moveToNext());
}
goodCursor.close();
}
//////////////Home And Back Button
@Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_HOME)
BackToMainIntent();
else if(keyCode==KeyEvent.KEYCODE_BACK)
{
BackToMainIntent();
}
return false;
}
public void BackToMainIntent()
{
Intent intent = new Intent(this, Main.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
}
答案 0 :(得分：0)
分离适配器声明的目的是什么？
setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, goods));
listView = getListView();
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
mAdapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, goods);
android.R.layout.simple_list_item_single_choice只包含一个CheckedTextView，表示该数组只会投射一列。
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeightSmall"
android:textAppearance="?android:attr/textAppearanceListItemSmall"
android:gravity="center_vertical"
android:checkMark="?android:attr/listChoiceIndicatorSingle"
android:paddingStart="?android:attr/listPreferredItemPaddingStart"
android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
/>
如果要显示所有列值，则必须创建自定义适配器。请参阅here和Vogella tutorial。